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[論文] 切削中인 工具의 傾斜面上에 Crack 을 갖는 경우의 應力解析에 관한 硏究
김원일(W.I.Kim),남준우(J.W.Nam) 한국자동차공학회 1987 오토저널 Vol.9 No.3
The determination of stress distributions on the rake face of tool are important to understand the mechanism of metal cutting. For this reason, many researchers have been payed much effort to analyize machining stress distribution on the rake face.<br/> The author's photoelastic experiment has shown that the stress distributions on a rake face can be obtained photoelastically by using a specially designed tool made of epoxy resin plate, and also, Stress Intensity Factors K_I, KII and Crack Extension Angle can be determined by using Linear Elastic Fracture Mechanics.<br/>
[論文] 應答表面法에 의한 切斷바이트의 工具壽命式에 關한 硏究
김원일(W.I.Kim),이윤경(Y.K.Lee),남준우(J.W.Nam),송지복(J.B.Song),최만성(M.S.Choi) 한국자동차공학회 1988 오토저널 Vol.10 No.2
This paper presents a study of tool-life equation on cut-off test by the statistical approach, refered to as response surface methodology instead of a conventional one-variable at a time method.It is the merit of response surface methodology that the test time is reduced to minimize the size and accurate analysis can be done.The reliability of such an equation can also be estimated.Two independent variables, cutting speed and feed rate, were investigated.A first order modeling equation is presented in this project.<br/> The results of this study are as follows that tool-life in cut-off operation is affected by cutting speed more than feed, and first order tool-life predicting equations are in good agreeement with experimental results.
이영무(Y.M.Lee),조선휘(S.W.Cho),남준우(J.W.Nam) 한국자동차공학회 1984 오토저널 Vol.6 No.1
Stress analysis of split ring with four different radius ratios under the compressive load is made by the photoelastic experiment and the numerical analysis through the FEM.<br/> The results of the two methods agreed well.<br/> Above results are also compared with those of the theoretical formula in order to confirm the range in which the formula of the curved bar is applied in connection with the radius ratio.<br/> The results of the two methods agreed well with those of the formula for the radius ratio.<br/> 3/2 and 9/7 w.ithin small errors of around 7% and 5% respectively.<br/>